<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card class="box-card">
      <!-- 提示信息 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" align-center :active="activeIndex - 0" finish-status="success">
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏 -->
      <el-form :model="addForm" label-position="top" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-tabs v-model="activeIndex" :tab-position="'left'" @tab-click="tabClicked" :before-leave="beforeTabLeave">
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                    v-model="addForm.goods_cat"
                    :options="catelist"
                    prop="goods_cat"
                    :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children' }"
                    @change="handleChange"></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <!-- 渲染表单的item项 -->
              <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <!-- 多选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                    <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <!-- 渲染属性列表 -->
              <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!-- action：上传路径，on-preview：图片预览事件 -->
              <el-upload
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                :headers="headers"
                :on-success="handleSuccess"
                list-type="picture">
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器 -->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <el-button class="finish" @click="finishAdd" type="primary">完成添加</el-button>
            </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览区域 -->
    <el-dialog title="图片预览" class="previewImg" :visible.sync="previewDialogVisible" width="50%">
      <img :src="previewPath" alt="">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      // 激活的步骤
      activeIndex: '0',
      // 添加商品表单
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        // 上传图片的临时路径
        pics: [],
        // 商品描述
        goods_introduce: '',
        attrs: []
      },
      // 添加商品表单验证规则
      addFormRules: {
        goods_name: [{
          required: true, message: '请输入商品名称', trigger: 'blur'
        }],
        goods_price: [{
          required: true, message: '请输入商品价格', trigger: 'blur'
        }],
        goods_weight: [{
          required: true, message: '请输入商品重量', trigger: 'blur'
        }],
        goods_number: [{
          required: true, message: '请输入商品数量', trigger: 'blur'
        }],
        goods_cat: [{
          required: true, message: '请选择商品分类', trigger: 'blur'
        }]
      },
      // 分类数据
      catelist: [],
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片路径
      uploadURL: 'http://119.23.53.78:8888/api/private/v1/upload',
      // 图片上传组件的请求头
      headers: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 控制预览窗口和隐藏
      previewDialogVisible: false,
      // 预览图片路径
      previewPath: ''
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 初始化页面，获取商品分类数据
    async getCateList () {
      const {
        data: res
      } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$msg.error('获取商品分类列表失败')
      }
      // 吧数据列表赋值给catelist
      this.catelist = res.data
    },
    // 级联选择器变化触发此函数
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 离开当前标签页时触发activeName:新标签页 oldActiveName：旧标签页
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$msg.error('请先选择商品所属分类')
        return false
      }
    },
    // 切换tab标签页时触发
    async tabClicked () {
      // 访问动态参数面板时
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) {
          return this.$msg.error('获取参数失败')
        }
        // 分割attr_vals数组的值
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$msg.error('获取属性失败')
        }
        // console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    // 图片预览事件
    handlePreview (file) {
      this.previewPath = file.url
      this.previewDialogVisible = true
    },
    // 移除图片事件
    handleRemove (file) {
      // 获取图片临时路径
      const filePath = file.response.data.tmp_path
      // 从pics数组中找到对应的索引值
      const i = this.addForm.pics.findIndex(p => p.pic === filePath)
      // 用splice方法将其移除
      this.addForm.pics.splice(i, 1)
      if (i !== filePath) {
        return this.$msg.success('移除图片成功')
      }
      this.$msg.error('移除图片失败')
    },
    // 上传成功事件
    handleSuccess (response) {
      // 获取上传的图片对象
      const picInfo = { pic: response.data.tmp_path }
      // 将图片对象push到pics数组中
      this.addForm.pics.push(picInfo)
      return this.$msg.success('上传成功')
    },
    // 完成添加商品
    finishAdd () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$msg.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // lodash   cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods/', form)
        if (res.meta.status !== 201) {
          return this.$msg.error('添加商品失败！' + res.meta.msg + '商品名称必须唯一')
        }
        this.$msg.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
  .el-steps{
    margin-top: 15px;
  }
  .el-step__title {
    font-size: 13px!important;
  }
  .el-checkbox {
    margin: 0 10px 0 0 !important;
  }
  .finish{
    margin-top: 15px;
  }
  .previewImg {
    img{
      max-width: 100%;
    }
  }
</style>
